After more than a year of development, the Insecure.org developers have released version 5.50 of Nmap, their popular open source network scanner and mapper. According to the developers, the primary focus of this second stable update since Nmap 5.00 is the Nmap Scripting Engine (NSE); this "has allowed Nmap to expand up the protocol stack and take network discovery to the next level".

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump